抄録
Our study deals with the recycling and strain rate effects on the mechanical behaviour of polymer composites. We particularly focus on high impact polypropylenes (rubber filled PP). These materials used for car bumpers and front shields are talc filled and unfilled impact modified polypropylene. Virgin specimens have been reprocessed (extruded) six times in order to evaluate the degradation due to recycling. Tensile tests have been performed for different strain rates. A comparison between experimental data obtained for both materials, virgin and recycled, have been carried out. These have permitted to quantify not only strain rate sensitivity but also the degradation of the mechanical properties after the recycling. Two approaches for the modelling of the stress-strain response are suggested in order to simulate the macroscopic behaviour: one valid for small strains and the other for large strains. Preliminary results of our simulations have been compared with the experimental data for virgin (none recycled) materials only and good agreements have been found.